Semestral Work Suppression of 50 Hz disturbance in ECG by notch-filter
Notch filter design • Transfer function:
• 50 Hz centered disturbance: c=0
19/01/2007
Yann KOWALCZUK
2
Notch filter design • Frequency and phase response
19/01/2007
Yann KOWALCZUK
3
Application on signals • ECG clean signal/ECG with 50 Hz noise
19/01/2007
Yann KOWALCZUK
4
Application on signals • ECG with 50 Hz/Result after filtering
19/01/2007
Yann KOWALCZUK
5
Application on signals • Waveforms with 50 Hz/Result after filtering
19/01/2007
Yann KOWALCZUK
6
Results • Initial SNR with 50 Hz: 0,6 dB • SNR over signal after filtering: dB • Linear phase response and 2nd order filter with really sharp attenuation • Useful for fixed frequency disturbance 19/01/2007
CIIR filter design • Frequency and phase response (r=0,5)
19/01/2007
Yann KOWALCZUK
9
CIIR filter design • Frequency and phase response (r=0,2)
19/01/2007
Yann KOWALCZUK
10
Application on signals • Same ECG+50 Hz/Filtered with CIIR
19/01/2007
Yann KOWALCZUK
11
Application on signals • Waveforms with 50 Hz/Result after filtering
19/01/2007
Yann KOWALCZUK
12
Results • SNR=1,54 dB • Non-linear phase: distorsion of signal • Distorsion on clean ECG: -4,75 dB • Influence of coefficient r 19/01/2007
Yann KOWALCZUK
13
Signal application • Adding 47,5 Hz disturbance to clean ECG
19/01/2007
Yann KOWALCZUK
14
Signal application • 47,5 Hz/Result with 2 different filters
19/01/2007
Yann KOWALCZUK
15
Results • Initial SNR of mixed signal= -0,22 dB • SNR notch filter= -0,22 dB => fixed frequency filtrering! • SNR CIIR filter= 1,21 dB • Distortion by CIIR filter(r=0.1): -4,75 dB • Fixed frequency attenuation 19/01/2007
Yann KOWALCZUK
16
Conclusion • Notch filter: very efficient on fixed signal disturbance • Order 2 with notch filters equivalent to very high order IIR filters • CIIR filter suitable when high and sharp attenuation needed but brings distortion 19/01/2007
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